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factotum: support sha256 algorithm in rsa pkcs#1 signing

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also removed md2 oid, it is unused.
This commit is contained in:
mischief 2017-02-09 09:08:43 +00:00
parent 6386a0391a
commit e8045cbcbf
1 changed files with 7 additions and 2 deletions
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9
sys/src/cmd/auth/factotum/rsa.c
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@ -219,6 +219,8 @@ rsawrite(Fsstate *fss, void *va, uint n)
dlen = SHA1dlen;
else if(strcmp(hash, "md5") == 0)
dlen = MD5dlen;
else if(strcmp(hash, "sha256") == 0)
dlen = SHA2_256dlen;
else
return failure(fss, "unknown hash function %s", hash);
if(n != dlen)
@ -299,6 +301,7 @@ Proto rsa = {
*
* SHA1 = 1.3.14.3.2.26
* MDx = 1.2.840.113549.2.x
* SHA256 = 2.16.840.1.101.3.4.2.1
*/
#define O0(a,b) ((a)*40+(b))
#define O2(x) \
@ -309,9 +312,8 @@ Proto rsa = {
(((x)>> 7)&0x7F)|0x80, \
((x)&0x7F)
uchar oidsha1[] = { O0(1, 3), 14, 3, 2, 26 };
uchar oidmd2[] = { O0(1, 2), O2(840), O3(113549), 2, 2 };
uchar oidmd5[] = { O0(1, 2), O2(840), O3(113549), 2, 5 };
uchar oidsha256[] = { O0(2, 16), O2(840), 1, 101, 3, 4, 2, 1 };
/*
* DigestInfo ::= SEQUENCE {
* digestAlgorithm AlgorithmIdentifier,
@ -339,6 +341,9 @@ mkasn1(uchar *asn1, char *alg, uchar *d, uint dlen)
}else if(strcmp(alg, "md5") == 0){
obj = oidmd5;
olen = sizeof(oidmd5);
}else if(strcmp(alg, "sha256") == 0){
obj = oidsha256;
olen = sizeof(oidsha256);
}else{
sysfatal("bad alg in mkasn1");
return -1;